AirHint found the following cheapest return flights from Washington (DCA) to London (LGW) in May 2026 (see full year).

Return flights

13 May - 18 May	jetBlue
14 May - 03 Jun	jetBlue
15 May - 29 May	jetBlue
14 May - 06 Jun	jetBlue
15 May - 06 Jun	jetBlue
09 May - 16 May	jetBlue
15 May - 21 May	jetBlue
09 May - 30 May	jetBlue
04 May - 30 May	jetBlue
14 May - 25 May	jetBlue
18 May - 25 May	jetBlue
06 May - 30 May	jetBlue
20 May - 25 May	jetBlue
18 May - 13 Jun	jetBlue
19 May - 01 Jun	Porter Airlines (Canada) Ltd

Also check the deals for one-way flights from Washington to London in May.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Washington to London in May from $596

Return flights